/**
	*
	*  Base64 encode / decode
	*  http://www.webtoolkit.info/
	*
	**/
	var Base64 = {

	// private property
	_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

	// public method for encoding
	encode : function (input) {
	    var output = "";
	    var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
	    var i = 0;

	    input = Base64._utf8_encode(input);

	    while (i < input.length) {

	        chr1 = input.charCodeAt(i++);
	        chr2 = input.charCodeAt(i++);
	        chr3 = input.charCodeAt(i++);

	        enc1 = chr1 >> 2;
	        enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
	        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
	        enc4 = chr3 & 63;

	        if (isNaN(chr2)) {
	            enc3 = enc4 = 64;
	        } else if (isNaN(chr3)) {
	            enc4 = 64;
	        }

	        output = output +
	        this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
	        this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

	    }

	    return output;
	},

	// public method for decoding
	decode : function (input) {
	    var output = "";
	    var chr1, chr2, chr3;
	    var enc1, enc2, enc3, enc4;
	    var i = 0;

	    input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

	    while (i < input.length) {

	        enc1 = this._keyStr.indexOf(input.charAt(i++));
	        enc2 = this._keyStr.indexOf(input.charAt(i++));
	        enc3 = this._keyStr.indexOf(input.charAt(i++));
	        enc4 = this._keyStr.indexOf(input.charAt(i++));

	        chr1 = (enc1 << 2) | (enc2 >> 4);
	        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
	        chr3 = ((enc3 & 3) << 6) | enc4;

	        output = output + String.fromCharCode(chr1);

	        if (enc3 != 64) {
	            output = output + String.fromCharCode(chr2);
	        }
	        if (enc4 != 64) {
	            output = output + String.fromCharCode(chr3);
	        }

	    }

	    output = Base64._utf8_decode(output);

	    return output;

	},

	// private method for UTF-8 encoding
	_utf8_encode : function (string) {
	    string = string.replace(/\r\n/g,"\n");
	    var utftext = "";

	    for (var n = 0; n < string.length; n++) {

	        var c = string.charCodeAt(n);

	        if (c < 128) {
	            utftext += String.fromCharCode(c);
	        }
	        else if((c > 127) && (c < 2048)) {
	            utftext += String.fromCharCode((c >> 6) | 192);
	            utftext += String.fromCharCode((c & 63) | 128);
	        }
	        else {
	            utftext += String.fromCharCode((c >> 12) | 224);
	            utftext += String.fromCharCode(((c >> 6) & 63) | 128);
	            utftext += String.fromCharCode((c & 63) | 128);
	        }

	    }

	    return utftext;
	},

	// private method for UTF-8 decoding
	_utf8_decode : function (utftext) {
	    var string = "";
	    var i = 0;
	    var c = c1 = c2 = 0;

	    while ( i < utftext.length ) {

	        c = utftext.charCodeAt(i);

	        if (c < 128) {
	            string += String.fromCharCode(c);
	            i++;
	        }
	        else if((c > 191) && (c < 224)) {
	            c2 = utftext.charCodeAt(i+1);
	            string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
	            i += 2;
	        }
	        else {
	            c2 = utftext.charCodeAt(i+1);
	            c3 = utftext.charCodeAt(i+2);
	            string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
	            i += 3;
	        }

	    }

	    return string;
	}

	}
